Log4NoShell

A Java Agent that disables Apache Log4J's JNDI Lookup to aid against CVE-2021-44228 ("Log4Shell").

If possible, update your program to use the latest Log4J version, as the vulnerability is fixed as of version 2.17.1. Otherwise, download log4noshell-0.4-SNAPSHOT-shaded.jar and continue reading.

Usage

To use Java Agents, you must specify them with the -javaagent argument.
java -jar -javaagent:path/to/log4noshell-0.4-SNAPSHOT-shaded.jar Program.jar

Minecraft

Please read Mojang's response to the matter to determine if you need this patcher.

• Client:
  1. Go to the Installations tab in the launcher
  2. Click on the three dots on the right side of the version you'd like to use
  3. Click Edit
  4. Scroll down and click on More Options
  5. Add -javaagent:path/to/log4noshell-0.4-SNAPSHOT-shaded.jar to the JVM Arguments text-field
     • -javaagent:path/to/log4noshell-0.4-SNAPSHOT-shaded.jar -Xms2G -Xms2G...
  6. Click Save
• Server:
  1. Add -javaagent:path/to/log4noshell-0.4-SNAPSHOT-shaded.jar somewhere before the -jar in your launch/start/run command
     • java -javaagent:path/to/log4noshell-0.4-SNAPSHOT-shaded.jar -jar minecraft_server.jar